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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '77753d2f32706d1191a54835cfedcb16d0093711f86a0aa7da3f5c4c2d45baae' 
  AND token = 'BN7830HqWKzbxwon5WbAR7kBEs1aXjqq8XgPJGIT9A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}